Machine for making green-sand cores



(No Model.) 2 Sheets--Sheet 1'. W. B.. STERRIT. MACHINE FOR MAKING GREEN SAND GORES. No. 470,517. Patented Mar. 8, 1892.

i TTM 2- sheets-sheet 2.,

(No Model.)

W. B.. STBRRIT. MAGHINE PoR MAKING-GREEN SAND CORPS.i No. 470,517.

Patented Mar. 8, 1892 ma ohms Varens col, mo'ruwo., WASHINGTON, q. c."

, To all whom it may concern:

UNITED STATES PATENT OEEICE.

VILLIAM STERRIT, OF PITTSBURG, l?ENNSYLVANIA.4

MACHINE FOR MAKING GREEN-SAND CORES.

SPECIFICATION forming part of Letters Patent No. 470,517, dated March 8, 1892. I

`Application tiled December 10, 1890. Serial No. 374,135. (No model.)

Be it known that I, WILLIAM B. STERRIT, a

citizen of the United States, residing at Pittst burg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Machines for` Making Green-SandCores; and l do hereby declare the following to be a full, clear, and exact description of the invention, reference being had to the accompanying drawings, which form part of this specification.

This invention has relationto machines for making green-sand cores for hollow castings, and relates particularly to machines for making cores to be used in casting journal-boxes and the like.

The object of this invention is to provide a machine for compressing the green sand within a core-box and upon a suitable core-bar,

-thereby obviating the necessity of preparing the core by hand.

In the machine embodying my invention the core-box adapted to contain the core-bar is constructed with movable side walls or a Vmovable bottom and is provided with means for forcing the sides or the bottom, as the case may be, inwardly and upon and against he body of green sand from which the core is to be formed. Means are also provided for the displacement or temporary removal of certain portions ofthe core-boX, so as to obtain access to the interior of the same for the purpose of lling in the sand preparatory to completing the core and for the purpose of allowing the core to be removed after completion. l

My invention consists in the novel construction, combinations, and arrangements of parts hereinafter described.

In the following specification I shall limit' myself to a specific description of a machine for forming green-sand cores for Journalboxes, it being understood, however, that the same machine orf its essential parts may be employed in forming green-sand .cores for a great variety of hollow castlngs.

Referring to the accompanying drawings, Figure l is a vertical longitudinal section of a machine for forming green-sand cores for journal-boxes. Fig. 2 is a vertical transverse section of the same looking to the right of Fig. 1. Fig. 3 is a horizontal section on the line X X of Fig. 2. Fig. 4t is a perspective view of the slides which embrace the core of the dust-chamben Fig. 5 is a sectional view of adetail. Fig. 6 is adetail perspective view of the catch for holding the swinging arch in position. Fig. 7 is a transverse sectional view looking to the left of Fig. l and showing the vertical side walls drawn out; and Fig. 8 is a Vperspective View of the core-bar, showing the core-bar and the end plates on which it is tion shown in Figs. 1, 2, and 3, A designates a casting constituting the bottom of the corebox and having its upper surface shaped to coincide or correspond with the contour which it is desired to give to the bottom of the core. ends by substantial standards B B, `which constitute the end frames of the machine and are secured to a base plate or frame C.

Dis a strong metallic arch, which spans the space between the two end frames B B and rests at its ends upon the tops of said frames. The arch D is pivotally attached to one of theframes B, so that it may be swung around with the top plate of the core-box which it supports, and when in position is secured at its other end to theother of thel boX, which are secured to the frame of the` machine and rest upon the bottom 'of the coreboX, and the inner surface of the plate is shaped to conform with the shape of the finished core. These stationary end sections, of which there are four, are clearly shown in the sectional view, Fig. 3, and they consist of IOO metallic sections of L shape in horizontal section, the shorter side of each section being lbolted to the end frames B B and the longer side of each section being in line with the removable end plates g g of the core-bar when thelatter is in position in the core-box. The stationary end sections are lettered Hv in Fig. Sand serve, as before stated, to support the plate E at its ends.

G designates the core-bar, which is sup-v ported within the core-box by means of iian ged end plates g g, mortised for the reception ot' the tenons on the ends of said bar, said tenons being pierced laterally to receive wedgeshaped fastening-keys g g. The core-bar G is of tapering form or wedge-shaped, so as to facilitate its withdrawal from the core, and is formed with tapering enlargements g2g2,

upon which are fitted and secured by suitable keys the perforated plates 7i h. `The end` plates g g rest upon thosel portions of thebottoinplatefof the core-box which. extend out beyond thelimits of the core and are removable with the core-bar, the said core-bar with the-end plates attached thereto being shown apart from the core-box in Fig. 8 of the drawings.

core-box, which rest and move uponthe bottoxnfplate of the vcore-box, and are flanged upon' their upper and lower. edges, as shown at 71 h', so as to give thenrwide bearings,

which will prevent irregular movement or the point of Contact is armed witha beveled e steel block dovetailed into the ends of the levers, similar blocks being dovetailed into the `sides H H ot' the box. The levers lL L are fulerumed below the bottom plate of the core-box upon horizontal shafts L L supported by or having their bearings in brackets L2 L2, depending from the bottom of the core-box. These levers L L are coupled at theirlower ends to toggle-arms M M, having their inner endsfpivotally connected to a mitm, that is secured'to a vertically-:reciprocating frame N, through which passes the operating-lever O, which ,is pivoted at o to the frame of the machine. When the lever, which is or'may bev secured to the frame N by a transverse pin, is lifted, and with it the inner ends of? the toggle-arms, the levers L L are drawn inwardly at their lower ends and outwardly at tlieir'upper ends, thus moving the sides of the `core-box away from the core. The descentof the lever N forces the sides ot the core-box inwardly and compresses the sand-to therequired degreeto form the core.

The frameNis guided in its vertical travel H H designatethe movable sides of the` by means of a pin N, rising from its upper portion and passing through ahole in abridge N2 connecting the brackets L2 L2.

P designates a narrow space formed at one end of the core-box by the slides P P2 P3 and intended to receive the dry-sand core, which forms the dust-chamber at the end ofthe journal-box. These slides tit in suitable grooves p p2 in the sides of the core-box, such grooves being ot' sufficient depth to give the slides a bearing in the sides when thelatter are drawn outwardly totheir fullest extent. The slides P P2 are connected together at their outer edges, so as to form an inclosed space, in which in closed space is fitted, previously to packing the sand, a dry-sand core, ywhich serveswhen the castingis niade'toleave .aspace that constitutes the dust-chamber of the journal-box, and they are supported from' abovebyL means of a lever q and connecting-rod q attached tothe arch D at q2. The top. plate El of the core-box is. transversely slotted at r 'r for the passage ofthe slides P P2.l The plate P. rests withinthe core-box upon shoulders formed at the bottom of its-'grooves p the semicircular recess in the-under part ofthe plate P, thus coinciding with the curvaturein the bottom of the core-box. The `plate P2restsupon the plate P2, which rises frombelow the bottom of the core-box through atransverse slot r', and is raised and lowered by` means of a lever S, connected thereto andpivoted aty s to the bottom of the core-box.

vThe operation of the machine above .described is as follows: The plates P P2P3 being withdrawn from the cavity of the corebox andthe top plate E raisedA by means of the screw F, the arch D is swung around to one side, earryingwith-it the topplate .E and its appendages. The core-bar, with its attachments, including the dry-sand core. that fits between the` plates P P2 P3, is now placed in position and the lever O raised, so as to draw outwardly the sides of the box. 'lhefgreen sand is now filled in in sufficient quantity and the arch swung around, brin-ging. the` top of the box .intoplaca The latter is now lowered and the slides P P2 P3 pushed home. The lever O is now lowered or forced downwardly and the sides of the core-box forced inwardly under great pressure, thus packing the sandv tightly around the core-bar and into.V all the spaces ot the core-box cavity. Theplates P P2 P3 are then withdrawn,the sides of the box drawn outwardly, and the top `plate shitted, thus exposing the perfect core, which may be thenlifted by means of the end plates and inserted into the mold.

' Having described my invention, I claim- 1. In a machine` for forming green-sand cores, the combination, with va supportingframe, of a core-box having a stationaryY bottom mounted on. said frame, laterally-movable side-walls supported and slidir g on saidI bottom plate, a movable top plate supported from said frame and covering and closing thetop ot' the core-box, and an adjustable supporting IOO IIO

device by which said top may be raised and lowered and shifted or moved horizontally, all constructed and arranged substantially as described.

2. In a machine for forming greensand cores, the combination, with a suitable supporting-frame, of a core-box having a stationary bottom plate, vertical side walls having stationary end sections and laterally-movable structed and adapted for the formation of cores for hollow castings, of a dry-sand core consisting of a fiat section of compressed dry and baked sand, having a central opening, and vertical slides seated in grooves in said core-box and embracing said dry-sand core, substantially as described.

5. In a machine for forming green-sand cores for hollow castings having dust-chambers, the combination, with the core-box and with a dry-sand core for forming a dust-chamber, of the slides P P2 P5, supported in grooves in the sides of said core-box and embracing the dry-sand core, and the levers S and q, connected to said slides and pivoted to the frame of the machine, substantially as described.

In testimony that I claim the foregoing I have hereunto set my hand this 6th day of November, 1890.

WILLIAM B. STERRIT. Witnesses:

A. A. CoNNoLLY, CHARLES G. SHOEMAKER. 

